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Molecular net boosts the power of natural biopesticides

Phys · · 537 words · By VIB

Researchers from VIB and Vrije Universiteit Brussel have identified a protein fiber network called 'sporesilk' that helps the biopesticide Bacillus thuringiensis (Bt) cluster spores and toxins together. This mechanism increases the efficiency of the bacteria in killing insect pests and may lead to the development of more potent, sustainable biopesticides.

open_in_new Read the original article: https://phys.org/news/2026-05-molecular-net-boosts-power-natural.html

analyticsAnalysis

10%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

12 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

info Single Source 5
verified Verified 2
help Insufficient Evidence 2
schedule Pending 2
verified Verified By Reference 1
info
“Scientists at VIB and Vrije Universiteit Brussel have uncovered a previously unknown mechanism that helps a widely used biological pesticide become more effective.”
SINGLE SOURCE
While Wikipedia confirms the existence of VIB and VUB as research institutions, the specific claim about a new mechanism for biological pesticides is not corroborated by the provided search results. One search result mentions 'sporesilk' in a snippet, but there isn't enough independent corroboration to mark it as verified.
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wikipedia NEUTRAL — Jan Steyaert is a Belgian bioengineer and molecular biologist. He started his career as an enzymologist but the Steyaertlab is best known for pioneering work on (engineered) nanobodies for application…
https://en.wikipedia.org/wiki/Jan_Steyaert
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wikipedia NEUTRAL — VIB is a research institute located in Flanders, Belgium. It was founded by the Flemish government in 1995, and became a full-fledged institute on 1 January 1996. The main objective of VIB is to stren…
https://en.wikipedia.org/wiki/Vlaams_Instituut_voor_Biotechn…
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wikipedia NEUTRAL — The Vrije Universiteit Brussel (Dutch: [ˈvrɛiə ʔynivɛrsiˈtɛid ˈbrʏsəl] ; lit. 'Free University of Brussels'; abbreviated VUB) is a Dutch- and English-speaking research university in Brussels, Belgium.…
https://en.wikipedia.org/wiki/Vrije_Universiteit_Brussel
+ 3 more evidence sources
info
“The study, published in Nature Communications, reveals how bacteria produce ultra-strong protein fibers that form a molecular net, trapping infectious spores and toxins into a sticky film that enhances their ability to kill insect pests.”
SINGLE SOURCE
Wikipedia confirms Nature Communications is a multidisciplinary scientific journal, but the specific study details regarding protein fibers and molecular nets are not independently corroborated in the provided evidence snippets.
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wikipedia NEUTRAL — Communications Physics is a peer-reviewed and open access, scientific journal in the field physics published by Nature Portfolio since 2018. The chief editor is Elena Belsole. It was created as a sub-…
https://en.wikipedia.org/wiki/Communications_Physics
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wikipedia NEUTRAL — Nature Communications is a peer-reviewed, open access, scientific journal published by Nature Portfolio since 2010. It is a multidisciplinary journal that covers the natural sciences, including physic…
https://en.wikipedia.org/wiki/Nature_Communications
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wikipedia NEUTRAL — Nature Portfolio (formerly known as Nature Publishing Group and Nature Research) is a division of the international scientific publishing company Springer Nature that publishes academic journals, maga…
https://en.wikipedia.org/wiki/Nature_Portfolio
+ 3 more evidence sources
verified
“Bacillus thuringiensis (Bt) is a bacterium widely used in eco-friendly pest control.”
VERIFIED BY REFERENCE
Wikipedia and other web sources explicitly state that Bacillus thuringiensis (Bt) is a soil-dwelling bacterium and the most commonly used biological pesticide worldwide.
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web search NEUTRAL — Bacillus, from Latin "bacillus", meaning "little staff, wand", is a genus of Gram-positive, rod-shaped bacteria, a member of the phylum Bacillota, with 266 named species.
https://en.wikipedia.org/wiki/Bacillus
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web search NEUTRAL — Bacillus, any of a genus of rod-shaped, gram-positive, aerobic or (under some conditions) anaerobic bacteria widely found in soil and water. Some types of Bacillus bacteria are harmful to humans, plan…
https://www.britannica.com/science/bacillus-bacteria
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web search NEUTRAL — Jan 29, 2026 · Bacillus species are easily recovered on blood and chocolate agars and grow optimally at environmental temperatures (25 to 37°C). All species except B. anthracis are motile and beta-hem…
https://www.uptodate.com/contents/bacillus-cereus-and-other-…
verified
“It works by attacking insect larvae in two stages. First, it releases toxins that damage the insect's digestive system, creating an opening for spores to enter. The spores then germinate and multiply, consuming the insect from the inside.”
VERIFIED
Web search results from Wikipedia and IntechOpen confirm that Bt works by releasing toxins that target insect larvae, and some sources discuss the multiplication of bacteria in the host.
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web search NEUTRAL — Gram stain of Bacillus thuringiensis under 1000 × magnification. Bacillus thuringiensis (or Bt) is a gram-positive, soil-dwelling bacterium, and is the most commonly used biological pesticide worldwid…
https://en.wikipedia.org/wiki/Bacillus_thuringiensis
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web search NEUTRAL — The toxins of Bacillus thuringiensis (Bt) have shown great potential in the control of harmful insects affecting human health and agriculture, used as the main biological agent for the formulation of …
https://www.intechopen.com/chapters/67369
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web search NEUTRAL — Bacillus thuringiensis strains able to kill the insects did not always multiply in cadavers. Strains with no specificity to kill the insect sometimes multiplied when the insects were killed mechanical…
https://www.academia.edu/101601486/Effect_of_Bacillus_thurin…
verified
“Because Bt targets only certain insects, it's considered safe for humans, other wildlife, and helpful insects like bees.”
VERIFIED
Multiple sources, including Peptech Biosciences and Wikipedia, state that Bt targets insects selectively and is considered safe for humans and beneficial insects.
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web search NEUTRAL — Gram stain of Bacillus thuringiensis under 1000 × magnification. Bacillus thuringiensis (or Bt) is a gram-positive, soil-dwelling bacterium, and is the most commonly used biological pesticide worldwid…
https://en.wikipedia.org/wiki/Bacillus_thuringiensis
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web search NEUTRAL — Is Bacillus thuringiensis safe for humans and beneficial insects? It targets insects selectively and affects only specific insect larvae. At what stage of insect, Bacillus thuringiensis must be applie…
https://peptechbio.com/bacillus-thuringiensis-kurstaki-techn…
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web search NEUTRAL — The specific targeting of pest insects by Bt-crops is unrivaled in commercial pest management, but this does not preclude possible negative effects on non-target insects.
https://entsoc.org/sites/default/files/files/Science-Policy/…
info
“Researchers at the VIB-VUB Center for Structural Biology have now identified the answer: a previously unknown fibrous network they call "sporesilk," a natural nanofiber net with remarkable properties.”
SINGLE SOURCE
The existence of the VIB-VUB Center for Structural Biology is confirmed via LinkedIn, and a search result mentions 'sporesilk' in the context of Bt, but the specific discovery claim is not corroborated by multiple independent sources.
travel_explore
web search NEUTRAL — Centers for Disease Control and Prevention.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle…
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web search NEUTRAL — Researchers from the VIB-KU Leuven Center For Neuroscience and the VIB-VUB Center for Structural Biology zoomed in on TRPM3, an ion channel central to pain signaling and linked to epilepsy and neurode…
https://be.linkedin.com/company/vib-vub-center-for-structura…
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web search NEUTRAL — Subscribe to the Nucleus Biology channel to see new animations on biology and other science topics, plus short quizzes to ace your next exam: https://bit.ly/...
https://www.youtube.com/watch?v=URUJD5NEXC8
info
“the team discovered that Bt spores and toxin crystals are embedded in a dense mesh of protein fibers just eight nanometers wide.”
SINGLE SOURCE
A web search result mentions 'Auto-crosslinking sporesilk fibers promote endospore and Cry toxin...', which aligns with the claim, but there is only one specific source providing this technical detail.
travel_explore
web search NEUTRAL — This 3D animation shows how proteins are made in the cell from the information in the DNA code.
https://www.youtube.com/watch?v=gG7uCskUOrA
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web search NEUTRAL — ABC toxin complexes (Tcs) are a class of large, multi-subunit protein complexes pro- duced by bacteria. They are widespread in pathogens of insects, and are also present in several mammalian pathogens…
https://www.researchgate.net/figure/Mode-of-action-of-Bt-Cry…
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web search NEUTRAL — Bt toxins exhibit a distinctive composition unique to each strain, resulting in a remarkable selectivity for specific insect genera. The toxins are produced as pro-toxins that assemble into pure or mi…
https://www.researchsquare.com/article/rs-6239967/v1
info
“These fibers form a highly organized, double-helical structure and are chemically crosslinked into an exceptionally stable material.”
SINGLE SOURCE
The provided evidence for this claim consists of stock market data (TSX) which is completely irrelevant to the scientific claim about protein fibers.
travel_explore
web search NEUTRAL — Stay on top of your portfolio with real-time data, historical charts and the latest news from the Toronto Stock Exchange (TSX) on BNN Bloomberg.
https://www.bnnbloomberg.ca/markets/tsx/
travel_explore
web search NEUTRAL — Track the S&P/TSX (^TSX) Composite Index with our live price chart. Stay updated with real-time market data, news and comprehensive analysis.
https://investingnews.com/sp-tsx-composite-index/
travel_explore
web search NEUTRAL — Please seek professional advice to evaluate specific securities or other content on this site.
https://www.tsx.com/
help
“The fibers assemble themselves and remain intact under extreme conditions, including heat, drought, harsh chemicals, and mechanical stress.”
INSUFFICIENT EVIDENCE
No evidence was found after searching for the stability of sporesilk fibers under extreme conditions.
help
“When the researchers removed the gene responsible for these fibers, the clusters fell apart. As a result, the bacteria became less effective at killing insect larvae, with delayed mortality observed in experimental models.”
INSUFFICIENT EVIDENCE
No evidence was found after searching for the results of gene removal experiments regarding sporesilk fibers.
schedule
“adding the fibers, either through genetic engineering or by simply mixing in purified fibers, restored spore–toxin clustering and significantly increased insect-killing efficiency.”
PENDING
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“Mike Sleutel et al, Auto-crosslinking sporesilk fibers promote endospore and Cry toxin clustering, Nature Communications (2026). DOI: 10.1038/s41467-026-70495-z”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.